/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: mirac
 * Date: 2025-07-19
 * Time: 18:00
 */
public class Main_4 {
    public static void main(String[] args) {
        String s1 = "abcd";
        String s2 = "ABCD";
        String s3 = "a-A";

        System.out.println(s1.toUpperCase());
        System.out.println(s2.toLowerCase());
        System.out.println(s3.toUpperCase());
        System.out.println(s3.toLowerCase());
    }
}
